Actually, I hear a humming sound at 60-65 on de-acceleration on my '05 and definitely will inquiring at the Dealer for a reply. It may be normal engine noise at higher revs for the big 5.6 liter which being still kind of new might be still seating and expanding with break-in. I will post their reponse. Like to hear whatever you find out about the noise you are experiencing. :duh:TooTall said:Does anybody experience a humming sound when DECELERATING all the way off the accelerator at speeds around or above 80mph? Just curious to see if mine is unique with this problem...